Not totally sure, but I guess it’s a external link on Google website. But you don’t get into att(dot)com directly … first you get to another Google page which redirects you to the external web. When people right click and copy link location, they don’t copy the external page, but the Google redirection page.
I also think it has to do with tracking like Amazon with “…/ref=…”. Another reason I want to see and maybe edit links on QR-Codes before enter these.
Never heard about it before. But amaroks example link looks totally different to the example link of the first article you shared (howtogeek) where you have “…/amp/…” inside. Again, I’m not totally sure. It just looks like to me …
I guess people are posting a search result? Or maybe (I don’t know, I don’t use chrome) if you type a website’s address into chrome it automatically redirects through google, presumably so google can track it. Just a guess though.